Nordyne M1MB056ABW Furnace Manual

The Nordyne M1MB056ABW is a high-efficiency gas furnace with 56,000 BTU input capacity, multi-speed blower motor, electronic ignition system, durable heat exchanger, and safety controls. Designed for residential heating applications with AFUE rating up to 80%, this furnace features easy installation, reliable performance, and comprehensive safety systems including flame rollout protection and limit switches. Below are key sections for safety, specifications, installation, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Venting Requirements 7. Electrical Connections 8. Gas Line Connections 9. Maintenance Procedures 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Heat exchanger, blower assembly, gas valve, electronic ignition, pressure switches, limit controls, venting system.

Feature	Description
Heat Exchanger	Durable aluminized steel construction
Blower Motor	Multi-speed PSC motor for optimal airflow
Ignition System	Hot surface electronic ignition
Gas Valve	Automatic gas control with safety shutoff
Pressure Switches	Verify proper venting operation
Limit Controls	Prevent overheating conditions
Flame Rollout Switch	Safety protection against flame rollout
Inducer Motor	Draft inducer for proper venting
Control Board	Integrated furnace controller
Filter Rack	Standard 1-inch filter accommodation

Installation

Unpack and inspect all components. Verify furnace model matches requirements.

Location selection: Choose area with proper clearance and ventilation.
Venting installation: Install PVC vent pipes according to local codes.
Gas line connection: Use approved pipe and fittings; pressure test required.
Electrical wiring: Connect 120V power supply and thermostat wiring.
Ductwork connection: Attach supply and return ducts securely.

WARNING! Installation must comply with all local codes and regulations. Gas line work should be performed by qualified technician.

First-Time Setup

Complete installation verification before initial startup.

Gas pressure check: Verify manifold pressure is 3.5" WC for natural gas.
Venting verification: Confirm proper draft and vent pipe slope.
Electrical check: Verify proper voltage and grounding.
Airflow measurement: Check static pressure and adjust blower speed.
Initial startup: Follow lighting instructions on furnace label.

CAUTION! Never bypass safety controls. Ensure proper combustion air supply.

Specifications

Input Capacity: 56,000 BTU/H
Output Capacity: 44,800 BTU/H
AFUE Rating: Up to 80%
Gas Type: Natural Gas
Manifold Pressure: 3.5" WC Natural Gas
Electrical: 120V, 60Hz, 1 Phase
Blower Speeds: Multi-speed for heating/cooling
Venting: PVC Category IV
Dimensions: Check installation manual for exact measurements
Weight: Approximately 85 lbs

Controls and Settings

Integrated control board manages all furnace operations with LED status indicators.

Thermostat Connections: R, W, G, C terminals for standard thermostat wiring.

Blower Settings: Heating and cooling speeds adjustable via motor taps. Gas Valve: Manual shutoff valve included. Pressure Switches: Verify venting operation. Limit Controls: Auto-reset high limit protection. Flame Sensor: Monitors burner operation. Ignition Control: Direct spark ignition system.

Venting Requirements

Category IV venting system required with PVC pipe.

Vent pipe size: 2" or 3" PVC depending on installation.
Maximum vent length: Consult installation manual for specific requirements.
Termination clearance: Maintain proper clearances from windows and openings.
Slope requirements: Horizontal runs must slope upward toward termination.

Tip: Always install vent pipes according to manufacturer specifications and local codes.

Electrical Connections

120V power supply required with proper grounding.

Disconnect power before servicing.
Connect line voltage to furnace junction box.
Connect thermostat wires to control board terminals.
Verify proper polarity and grounding.
Install appropriate fuse or circuit breaker.

WARNING! Electrical work must be performed by qualified electrician following local codes.

Gas Line Connections

Black iron pipe or approved flexible connector required.

Install manual shutoff valve within 6 feet of furnace.
Use pipe joint compound rated for natural gas.
Pressure test entire gas line system.
Check for leaks with soap solution.
Verify manifold pressure after installation.

WARNING! Gas line installation must be performed by licensed professional. Never use matches to check for leaks.

Maintenance Procedures

Regular maintenance ensures optimal performance and safety.

Monthly filter replacement or cleaning.
Annual professional inspection and cleaning.
Check vent system for obstructions.
Verify burner operation and flame characteristics.
Inspect heat exchanger for cracks or damage.
Lubricate blower motor if required (check specifications).

CAUTION! Always disconnect power before performing any maintenance.

Regulatory Information

UL listed and ANSI certified. Complies with U.S. federal efficiency standards. Installation must comply with National Fuel Gas Code NFPA 54/ANSI Z223.1 and National Electrical Code NFPA 70. For technical support, contact Nordyne at 1-800-422-4328 or visit www.nordyne.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power disconnect, thermostat issue	Check power switch, thermostat settings, fuse/breaker
No heat	Gas supply, ignition failure	Verify gas valve on, check for ignition attempts
Short cycling	Dirty filter, limit switch	Replace filter, check airflow, verify limit operation
Blower not running	Motor failure, capacitor issue	Check voltage to motor, test capacitor, verify control signal
Lockout condition	Safety switch tripped	Reset power, check error codes, verify safety circuit

Reset Procedure: Turn power off for 30 seconds then restore.

Service: 1-800-422-4328; www.nordyne.com